Specifications

ISU AT Command Reference Phase IV AT Commands
Iridium Proprietary Version 2.45
20 June 2011 61
8 Phase IV AT Commands
8.1 –MSGEO - Request Geolocation
Exec Command: -MSGEO
Query the geolocation grid code received from the network in the last Access Decision Notification
message. The response is of the form:
-MSGEO: <x>,<y>,<z>,<time_stamp>
<x>, <y>, <z> is a geolocation grid code from an earth centered Cartesian coordinate system, using
dimensions, x, y, and z, to specify location. The coordinate system is aligned such that the z-axis is aligned
with the north and south poles, leaving the x-axis and y-axis to lie in the plane containing the equator. The
axes are aligned such that at 0 degrees latitude and 0 degrees longitude, both y and z are zero and x is
positive (x = +6376, representing the nominal earth radius in kilometres). Each dimension of the
geolocation grid code is displayed in decimal form using units of kilometres. Each dimension of the
geolocation grid code has a minimum value of –6376, a maximum value of +6376, and a resolution of 4.
<time_stamp> is assigned by the ISU when the geolocation grid code received from the network is stored
to ISU internal memory. Current Iridium system time, which is a running count of 90 millisecond intervals,
is used for the time stamp. Time stamp is a 32-bit integer displayed in hexadecimal form.
8.2 –MSGEOS - Request Geolocation, spherical co-ordinates
Exec Command: -MSGEOS
Same behaviour as MSGEO but provides the data in spherical co-ordinates.
The response is of the form:
-MSGEOS: <latitude>,<longitude>,<altitude>,<latitude_error>,
<longitude_error>,<altitude_error>,<time_stamp>
Where:
latitude = in degrees, 4 decimal places
longitude = in degrees, 4 decimal places
altitude = in meters
latitude_error = standard deviation in meters, currently 75000m
longitude_error = standard deviation in meters, currently 75000m
altitude_error = standard deviation in meters, currently 75000m
time_stamp = Iridium system time (90ms frames)
This command is provided in the 9575 handset only.
8.3 +CCFC - Call Forward service
Exec Command:
+CCFC=<reason>,<mode>[,<number>[,<type>[,class>[,<subaddr>[,<satype>[,<time>]]]]]]